This is an early, rare etching by Roth, one of a series of etchings of the Ponte Vecchio done over many years. This impression is from the collection of Roth's fellow etcher James D. Smillie, with whom Roth stuied etching at the National Academy. We have not been able to find another impression of this listed anywhere.
For more information on Roth's etchings of Venice read "Reflections & Undercurrents - Ernest Roth and Printmaking in Venice, 1900-1940" by Eric Denker, Dickenson College, ISBN: 978-0-9826125-4-5.